Re: [dev] RFC IMVCCStorage everywhere (Move ZODB's MVCC to storage layer)

On 6/10/16 5:25 PM, Jim Fulton wrote:
> What makes more sense is to split ZODB's MVCC support into a separate
> layer that's applied to storages **other than** RelStorage as an
> adapter.  
Brilliant!

That is a huge step towards a simple core with adapters for special cases. 

Exactly what we should be doing.

There is a big problem in Open Source software that people are adding
and adding to packages.  They get way way too bloated. They become too
complex to understand.  The way to solve this is with Adapters.  Have a
simple core with lots of optional adapters.  Sadly I do not know many
good examples.  If some examples are starting to show up in ZODB
that makes for an excellent talk. 

There was a well known course at MIT called Structure and Interpretation
of Computer Programs by Sussman and Abelson.  It is often discussed on
the web.  One year the two
professors showed up at the Department Office and announced that they
are no longer offering the course.  Their students were not architecting
applications from scratch, there were
reusing open source libraries and "poking at the code".  The professors
did not know what to teach.

What they should be teaching is how to build reusable libraries using
ZCA and adapters.  Have a very simple core with lots of adapters
for the more complex applications.  I am delighted to hear that ZODB is
moving in this direction.

I am hugely tempted to do some high level diagrams of how all of this is
designed.   That would make it so  much easier for newbies to understand
the architecture, and then review pull requests.

Chris

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